WO2016174262A1 - Dispositif de projection de lumière 3d - Google Patents

Dispositif de projection de lumière 3d Download PDF

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Publication number
WO2016174262A1
WO2016174262A1 PCT/EP2016/059760 EP2016059760W WO2016174262A1 WO 2016174262 A1 WO2016174262 A1 WO 2016174262A1 EP 2016059760 W EP2016059760 W EP 2016059760W WO 2016174262 A1 WO2016174262 A1 WO 2016174262A1
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WIPO (PCT)
Prior art keywords
light
light beam
spatial frequency
projection device
phase
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PCT/EP2016/059760
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English (en)
Inventor
Jesper GLÜCKSTAD
Andrew BANAS
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Optorobotix Aps
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Publication of WO2016174262A1 publication Critical patent/WO2016174262A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2286—Particular reconstruction light ; Beam properties
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/32—Systems for obtaining speckle elimination
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2294—Addressing the hologram to an active spatial light modulator
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
    • G03H1/0808—Methods of numerical synthesis, e.g. coherent ray tracing [CRT], diffraction specific
    • G03H2001/0816—Iterative algorithms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2210/00—Object characteristics
    • G03H2210/30—3D object
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/13—Phase mask
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00—Active addressable light modulator
    • G03H2225/30—Modulation
    • G03H2225/32—Phase only

Definitions

  • the present invention relates to a projection device, in particular for providing a 3D light distribution. Further, the present invention also relates to a projection system and a method for receiving and distributing a light beam.
  • Phase-only light shaping approaches can save more than 90% of the energy that is lost if using simple blocks or absorbing filters.
  • GPC Generalized Phase Contrast
  • GPC is a phase-to-intensity light shaping technique that can generate contiguous speckle-free extended shapes of spatially coherent light.
  • GPC is a point-to-point mapping of an input phase mask into output intensity, the input phase mask sets constraints on the distribution of the output beams, limiting the output to a single copy of the intensity pattern to the output imaging plane in two dimensions.
  • Holography is advantageous for generating sparse diffraction-limited spots with controllable axial and lateral locations.
  • holography generally suffers from noisy or speckled output when creating extended shapes of light.
  • the present disclosure combines in general the strengths of a phase-to-intensity light shaping technique and holography and relates to a device that is capable of distributing a plurality of well-defined speckle-free extended optical shapes over a wide working volume.
  • the present disclosure relates in a first aspect to a projection device for receiving and distributing a light beam, comprising: a light shaping element comprising a light shaping profile configured to form a profiled light beam; a lens element configured to transform the profiled light beam into a spatial frequency domain to form a frequency transformed light beam; a frequency filtering element configured to modify the frequency transformed light beam in the frequency domain to form a frequency filtered light beam; and a holographic element configured to diffract the frequency filtered light beam, thereby forming a plurality of projected light beamlets.
  • the holographic element is located in a plane substantially identical to the plane of the spatial frequency filtering element.
  • a method for receiving and distributing a light beam comprising: forming a profiled light beam using a light shaping element comprising a light shaping profile; forming a spatial frequency transformed light beam from the profiled light beam into a spatial frequency domain using a lens element; forming a frequency filtered light beam in the frequency domain from the frequency transformed light beam using a frequency filter; and forming a plurality of projected light beamlets from the frequency filtered light beam using a hologram configured to diffract the light beam.
  • a projection system for diffracting light from a light source comprising a single light source or multiple light sources, wherein the light source is adapted to emit a light beam into the projection device as described above. If multiple light sources are used the light sources may optionally be adapted to spatially isolate their respective spatial frequency distributions.
  • a new way of distribution of a light beam In using a device and/or method and/or system as described above, there is provided a new way of distribution of a light beam.
  • One effect of the present disclosure is that it facilitates a compact and low cost device.
  • a compact device may be obtained because the light shaping element is in front of the remaining elements in the device.
  • a low cost device may be obtained because none or just one of the elements may be a configurable or programmable element.
  • conventional projection devices there are typically two or more configurable or programmable elements.
  • Examples of configurable or programmable elements may be a spatial light modulator (SLM).
  • SLM spatial light modulator
  • the present disclosure provides a device where it is possible to use only a single or no SLM in order to project a plurality of light beamlets.
  • a further advantage of the present disclosure is that it also possible to provides a speckle-free distribution of a light beam.
  • a microscope system comprising a projection system as described above, and a microscope configured to receive the spatial light distribution.
  • Planar Light Valve based spatial light modulation for a variety of applications including high power handling, ultrafast switching, 'digital-to-plate', projection in UV, infrared and the visible
  • Computer-to-plate and direct transfer of digital content onto e.g. aluminum plates used in offset printing
  • High-performance display applications such as digital cinema, large-venue projection, planetariums, simulators and virtual reality displays - Direct light-write lithography with so-called laser-based direct-write mask-less solutions to avoid the time, expense and effort of generating and maintaining traditional photo-mask technology
  • SDM Space Division Multiplexing
  • Tailored applications to super-contiuum light sources (white light lasers)
  • Tailored applications to Optical Tomography applications including OCT - Tailored applications for parallel laser scanning in 2D and/or 3D
  • Optical cell sorting applications in 2D and/or 3D Optical catapulting applications in 2D and/or 3D - Optical space and aeronautics applications
  • Optical satellite communication applications Optical micro-robotics applications - Optical insect scanning, counting and analyzing applications
  • Illumination such as for car light, cinema, street light, entertainment - Materials processing such as cutting, welding, marking (tracking & identification of mechanical parts, medical devices, food & drug) and/or micromachining and drilling (stents, cellphones, tablets, tv, solar panels)
  • Lithography as the present invention may be ideal for repeating a pattern Description of drawings
  • Fig. 1 shows a first example of a device according to the present disclosure.
  • Fig. 2 shows a second example of a device according to the present disclosure.
  • Fig. 3 shows a third example of a device according to the present disclosure.
  • Fig. 4 shows a fourth example of a device according to the present disclosure.
  • Fig. 5 shows a fifth example of a device according to the present disclosure.
  • Fig. 6 shows an effect of using a spatial frequency filtering element according to the present invention.
  • the presently disclosed device comprises at least four elements - the light shaping element, the lens element, the spatial frequency filtering element, and the holographic element.
  • the order of the elements is preferably ordered sequentially as listed. As will be described below, it may in some embodiments be possible to re-order or combine some of the elements.
  • the elements can be spatially re-arranged with mirrors to limit the consumed footprint or adapt with the applications' constraints. The elements are described below in further detail.
  • Lens elements In addition to the at least four elements, additional lens elements may be provided.
  • the projection device as herein described may in some embodiments further comprise additional lens elements adapted to focus the plurality of light beamlets to form a plurality of focused light beamlets in one or more output focal planes.
  • a lens element is able to convert light from the spatial domain and into the frequency domain, or the other way around. Using Fourier optical calculations to see the change of variables, one representation of the frequency domain may be the Fourier frequency domain, or simply the Fourier domain.
  • a lens after a holographic element to display an intensity profile, but such setups provide holograms that are speckled.
  • the present disclosure may provide a speckle- free hologram by having the light shaping element, frequency transforming means, and the frequency filtering element before the holographic element.
  • the present disclosure may with the additional lens elements, be regarded as a conventional holographic setup, but with two lens elements set up before the holographic setup.
  • the light shaping element may be regarded as a conventional holographic setup, but with two lens elements set up before the holographic setup.
  • the light shaping element together with the lens element i.e. the first elements in the device, may be responsible for defining the point spread function (PSF) of the output beamlets.
  • the light shaping element together with the frequency transforming element may provide a desired illumination for the remaining elements, i.e. for the frequency filtering element and the holographic element.
  • the light shaping element may be intended for being used for forming an input that is related to illumination of a holographic element.
  • the light shaping element may be considered as a mask, for example a phase mask as preferred, or an amplitude mask.
  • the light shaping profile may be selected such that the light beamlets have output shapes formed as top-hat profiles.
  • these profiles do not overlapp with out-of-phase point spread functions (PSFs), i.e. PSFs formed by the light shaping element, that result in speckles or noise.
  • PSFs point spread functions
  • An example of contiguous light beams, i.e. when sufficiently distributed by the holographic element may for example be so-called top-hat beam profiles.
  • the light shaping profile may be selected such that the focused beamlets are converting a given beam profile to for example a top-hat beam profile.
  • An effect of having the beamlets formed by focused light beams that do not overlap, is that the projected light beams, i.e. the hologram, as displayed by the holographic element, wherein the illumination for the holographic element is provided by the light shaping element, do not interfere with each other, and thereby do not produce speckles.
  • the present disclosure may thus provide a speckle-free hologram by selecting or optimizing the light shaping profile.
  • the light shaping unit may be a phase-only element. In this way there may be no loss of intensity, and the output signal, i.e. the projected light beamlets may be optimally intense.
  • the phase-only element is a non-configurable phase-only element, such as a phase mask, for example made on a piece of glass material.
  • a phase mask for example made on a piece of glass material.
  • the phase-only element is a programmable phase-only element, such as a spatial light modulator (SLM).
  • SLM spatial light modulator
  • the light shaping profile comprises an inner part that is configured for allowing a central part of the light beam to pass unhindered, and an outer part that is configured for altering a peripheral part of the light beam.
  • the outer part is altering the phase of the light beam by introducing a phase shift relative to the inner part.
  • the phase shift is ⁇ . It can be found using Fourier optics, that such a phase shift provides means for transferring a Gaussian beam profile to a top-hat beam profile.
  • the outer part is altering the amplitude of the light beam by blocking the light.
  • the light shaping element may be an amplitude mask, i.e. reducing the amount of transferred light.
  • the light shaping element is known as an apodization mask.
  • the light shaping element is a phase apodization mask.
  • the light shaping element is for illumination, meaning illumination of the holographic element and defining the shape of the output beamlets.
  • the beamlet distribution or image may be provided by the holographic element, and the beamlet shape may be provided by the light shaping element.
  • the spatial frequency filtering element may in general be a phase contrast filter that is configured for maximizing contrast in the distributed light.
  • phase contrast filters such as Zernike filters and the like.
  • the spatial frequency filtering element is a phase contrast filter (PCF), where through phase shifting the lower spatial frequencies is done.
  • PCF phase contrast filter
  • a difference between a Zernike filter and a PCF is that the PCF is not based on the Zernike approximation, where a phase shift less than 1 radian is applied, and the PCF provides therefore an improved contrast over a Zernike filter.
  • the PCF is for example described in detail in WO 2005/0961 15 which is hereby incorporated by reference in its entirety.
  • the present disclosure provides a holographic element optically superposed with the frequency filtering device, the frequency filtering device is referred to a Fourier filter in WO 2005/0961 15, whereby the present disclosure is able to provide a device and system that is more compact than that disclosed in WO 2005/0961 15
  • the present disclosure provides means for providing a 3D hologram using a compact and/or low-resolution holographic element, thereby providing a low cost and efficient solution to 3D hologram display.
  • the present disclosure also provides means for using only one configurable element, such as an SLM, whereas the disclosure of WO 2005/0961 15 requires two SLMs coupled to each other via a computer.
  • WO 2005/0961 15 provides close to speckle-free light distribution, but the setup is much more demanding that the present disclosure.
  • the present disclosure may provide full speckle-free light distribution and much more efficient than that described in WO 2005/0961 15.
  • the present disclosure provides an alternative method and/or system to obtain a speckle-free light beamlet distribution.
  • the presently disclosed device and method may resemble a Generalized Phase Contrast (GPC) setup, in particular a GPC setup, where the light shaping element is setup to form a shaped output from a Gaussian input, except that in the present disclosure, the device further comprises a holographic element together with the phase contrast filter.
  • GPC Generalized Phase Contrast
  • a GPC setup is able to only provide an intensity profile to be sharply imaged in a 2D plane.
  • the present disclosure is therefore not limited to a single central beamlet and not limited to the usual imaging plane, but is stil capable of doing so if desired.
  • the present disclosure provides means for obtaining a compact device that is able to provide 3D speckle-free intensity projections.
  • the spatial frequency filtering element is a non-configurable phase-only element.
  • An example of a non- configurable phase-only element is the PCF.
  • An effect of using a frequency filtering element, in particular a PCF is that contrast at the output, for example at the focal planes, may be better than a device where a frequency filtering element is not used.
  • An example of the improvement in contrast, as by comparison to not using a PCF and using a PCF, can be seen in Fig. 6.
  • the outer part may be altering the phase of the light beam by introducing a phase shift relative to the inner part.
  • the spatial frequency filtering element is a programmable phase-only element, such as a spatial light modulator (SLM).
  • SLM spatial light modulator
  • the same SLM may have the holographic element encoded on it.
  • the spatial frequency filtering element may comprise an inner part that is configured for allowing a central part of the light beam to pass unhindered, and an outer part that is configured for altering a peripheral part of the light beam.
  • the holographic element is configured for providing a hologram, i.e. it is a medium where information is present, and displays a hologram when illuminated.
  • the holographic element is referred to as a hologram.
  • Examples of holograms are thin and thick (volume) holograms.
  • a simple hologram may be a grating that provides distribution of a light beam into a plurality of light beams.
  • a displayed hologram may be a computer generated hologram.
  • the holographic element may be a non-configurable phase-only element, such as a thin and thick (volume) hologram.
  • the holographic element may be a programmable phase-only element, such as a spatial light modulator (SLM).
  • SLM spatial light modulator
  • Using an SLM has several advantages. For example, for compactness, the same SLM may have the spatial frequency filtering element encoded on it.
  • the holographic element may allow for multiple copies of the intensity imaged light shaping element at the output.
  • an SLM the distribution of the copies, along the output plane or along the axial direction, may be controlled through the holographic element.
  • the overall intensity/energy may be distributed among the shape copies making them dimmer with more copies.
  • the relative brightness of each shape copy need not be equal, and may be tweaked using the SLM or pre-configured in the holographic element.
  • the holograms as provided by the SLM may numerically be calculated using algorithms such as the Gerchberg-Saxton (GS) algorithm, which is commonly used in digital holography.
  • the illumination patterns resulting from the Fourier transformed illuminated light shaping element may be used as input constraints in the algorithm.
  • the output constraints applied to the algorithm may determine the
  • the holographic element is located in a plane substantially identical to the plane of the frequency filtering element. Such a configuration provides for a compact device. In a configuration where the frequency transforming means is free- space, the hologram may optimally be placed at the far-field of the illuminated light shaping element.
  • the holographic element and the spatial frequency filtering element are integrated into one element.
  • both frequency filtering element and hologram may be on the same SLM.
  • the holographic element is located in a Fourier plane of the projection device.
  • the projection system is the projection system
  • the projection system may further comprise any of the features as described above.
  • the light beam comprises a beam profile that is a Gaussian function. This may for example be the case, when the light source is a laser.
  • the light source is a multi-color laser, such as a super continuum laser or composite RGB laser.
  • the light source is a laser comprising a laser fiber, such that the light beam is emitted from the laser fiber.
  • the light shaping element is integrated on the light source.
  • the light shaping element may be integrated on a tip of the laser fiber. Having such a configuration may allow for a very compact system. Because the light shaping element may be integrated on the light source, the surface may be relatively small, and thus be an efficient way of producing a system as disclosed herein.
  • the Fourier transformed input of the light shaping element mask is used as illumination, it is desirable to have it broad enough to cover the area of the holographic element.
  • One way of achieving this is to have a small input laser profile and input from the light shaping element. This may for example be realized by having the light shaping element integrated on the light source, as for example, having the light shaping element integrated on a tip of the laser fiber.
  • the light shaping element may be etched or additively manufactured on a tip of a single mode fiber (normally a few microns).
  • the frequency filtered light beam comprises a beam profile that is a Fourier transform of a desired shape such as an Airy-like or sinc-like function for a circular or rectangular beam, respectively.
  • a beam profile may provide a speckle-free distribution of beamlets that are copies of the desired shape.
  • the microscope system is configured for sorting objects.
  • the microscope system may be configured for sorting objects and using the spatial light distribution for sorting the objects. Because of the ability to provide a 3D light distribution, this has several advantages, for example when objects are not in a single plane.
  • the objects may be cells, for example in a flow cytometer, implementing a microscope.
  • Various applications other than a microscope are possible. Examples of applications may be related to display of hologram in relation to for example entertainment, such as TV and/or computer games.
  • the method may be performed by a projection device as described herein.
  • Example 1 an embodiment of the present disclosure:
  • Fig. 1 shows an example of the present disclosure and shows a projection device for receiving and distributing a light beam 00, comprising: a light shaping element 10 comprising a light shaping profile 11 configured to form a profiled light beam 12; a lens element 20 configured to transform the profiled light beam 12 into a spatial frequency domain to form a spatial frequency transformed light beam 21 ; a spatial frequency filtering element 30 configured to modify the spatial frequency transformed light beam 21 in the spatial frequency domain to form a spatial frequency filtered light beam; and a holographic element 40 configured to diffract the spatial frequency filtered light beam, thereby forming a plurality of projected light beamlets 41 (not shown).
  • a light shaping element 10 comprising a light shaping profile 11 configured to form a profiled light beam 12
  • a lens element 20 configured to transform the profiled light beam 12 into a spatial frequency domain to form a spatial frequency transformed light beam 21
  • a spatial frequency filtering element 30 configured to modify the spatial frequency transformed light beam 21 in the spatial frequency domain to form a spatial frequency filtered light
  • the device further comprises an additional lens element 50 adapted to focus the plurality of light beams to form a plurality of focused light beams in more output focal planes 51.
  • the light shaping element 10 is a phase-only element, in particular a non- configurable phase-only element.
  • the light shaping profile 11 comprises an inner part 13 that is configured for allowing a central part of the light beam 00 to pass unhindered, and an outer part 14 that is configured for altering a peripheral part of the light beam 00.
  • the outer part is altering the phase of the light beam by introducing a phase shift relative to the inner part, in particular the phase shift is TT, thereby producing a spatial frequency filtered light beam comprising a beam profile that is a sinc-function, such that a Gaussian light beam 00 is converted to a plurality of top-hat light beamlets 51 after being distributed by the holographic element 40. Because of this, the output of the light distribution is speckle-free.
  • the spatial frequency filtering element 30 is a non-configurable phase-only element.
  • the lens elements (20 and 50) are here shown as two elements, i.e. two lenses, each having a focal length f.
  • Example 2 another embodiment of the present disclosure:
  • Fig. 2 shows another example of the present disclosure and shows a projection device for receiving and distributing a light beam 00, comprising: a light shaping element 10 comprising a light shaping profile 11 configured to form a profiled light beam 12; a lens element 20 configured to transform the profiled light beam 12 into a spatial frequency domain to form a spatial frequency transformed light beam 21 ; a spatial frequency filtering element 30 configured to modify the spatial frequency transformed light beam 21 in the spatial frequency domain to form a spatial frequency filtered light beam; and a holographic element 40 configured to diffract the spatial frequency filtered light beam, thereby forming a plurality of projected light beamlets 41 (not shown).
  • a light shaping element 10 comprising a light shaping profile 11 configured to form a profiled light beam 12
  • a lens element 20 configured to transform the profiled light beam 12 into a spatial frequency domain to form a spatial frequency transformed light beam 21
  • a spatial frequency filtering element 30 configured to modify the spatial frequency transformed light beam 21 in the spatial frequency domain to form a spatial frequency filtered light
  • the device further comprises an additional lens element 50 configured to adapted to focus the plurality of light beamlets to form a plurality of focused light beamlets in more output focal planes 51.
  • the light shaping element 10 is a phase-only element, in particular a non-configurable phase-only element.
  • the light shaping profile 11 comprises an inner part 13 that is configured for allowing a central part of the light beam 00 to pass unhindered, and an outer part 14 that is configured for altering a peripheral part of the light beam 00.
  • the outer part is altering the phase of the light beam by introducing a phase shift relative to the inner part, in particular the phase shift is ⁇ , thereby producing a spatial frequency filtered light beam comprising a beam profile that is a sinc-function, such that a Gaussian light beam 00 is converted to a plurality of top-hat light beamlets 51 after being distributed by the holographic element 40. Because of this, the output of the light distribution is speckle-free.
  • the spatial frequency filtering element 30 is a non-configurable phase-only element.
  • the lens element 20 is here an element with no focusing power and no refractive index change, i.e. identical to free space, propagating in a distance d, whilst the additional lens element 50 is a lens having a focal length f.
  • Fig. 3 shows a device similar to that described and shown in Fig. 1 , except that in this example there are two additional lens elements, here shown as two lenses, in-between the spatial frequency filtering element 30 and the holographic element 40, thereby providing a system, where the spatial frequency filtering element 30 and the
  • holographic element 40 are in conjugate planes.
  • the holographic element is in a Fourier plane of the projection device.
  • the spatial frequency filtering element is also located in a Fourier plane of the projection device.
  • Example 4 - a fourth embodiment of the present disclosure related to a reflective system:
  • Fig. 4 shows a device that in principle is similar to that described and shown in Fig. 1. The only difference is that the spatial frequency filtering element 30 is here a reflective element, rather than a transmitting element as shown in Figures 1 -3. This example shows a very compact design.
  • Example 5 - a fifth embodiment of the present disclosure using a reflective light shaping element:
  • Fig. 6 shows an example wherein a reflective optical element is used as the light shaping element 10.
  • a reflective optical element may be an SLM allowing the output beamlet shapes to be programmed. It may also be a mirror with a raised or depressed region defining the shape of the output beamlets.
  • Example 6 an example of an effect of the spatial frequency filtering element:
  • Fig. 6 shows an example of an effect of using the spatial frequency filtering element according to the present disclosure.
  • Fig. 6.A there is shown a phase input as provided by the holographic element.
  • Fig. 6.B there is shown the amplitude output without a spatial frequency filtering element.
  • Fig. 6.C there is shown the amplitude output with a spatial frequency filtering element, in this example, a PCF. Comparing 6.B with 6.C, it can be seen that an improved contrast in amplitude is achieved in using the spatial frequency filtering element.
  • Example 7 An application of the present invention - 3D printing:
  • Additive manufacturing or 3D printing wherein an efficiently formed well-defined unit shape such as a top hat is used for scanning instead of a tiny spot.
  • the light distribution as formed by the present invention covers a greater area per given time, has sharper boundaries and is more robust to depth variations, hence leading allowing 3D printing with higher speed and quality. Higher speeds and quality makes 3D printing more practical and brings it closer to serious large-scale production instead of just prototyping. High speeds are also relevant for medical applications where implants or splices need to be deployed to the patient as quickly as possible. With sufficient laser power and a dynamic SLM, multiple top hats can be scanned across the photopolymer and therefore complete a 3D printed layer in much less time.
  • Example 8 - Another application of the present invention - Supercontinuum and multicolor lasers:
  • Efficiently shaped multispectral beams have many applications in research. Different wavelengths, efficiently shaped into uniformly intense tophats, for example, can be used to excite specimens in neurophotonics or optogenetics. 3D spatial selectivity can be added to multi-spectral applications such as spectroscopy, fluorescence microscopy or optical coherence tomography, while the efficiency means that less power is required from the state-of-the-art supercontinuum laser. Composite lasers containing RGB can be efficiently shaped for display or entertainment applications.
  • laser marked QR codes can be made quickly and with sharply defined straight edges by scanning a square shaped beam in the processed material.
  • Using cheaper static phase hologram masks instead of a dynamic, predefined periodic array of the shape can be used for creating periodic structures such as photonic crystals, gratings, or other semiconductor devices.
  • Specialized laser shapes have also increased performance or processing quality for laser cutting, welding, drilling or trepanning.
  • Specialized beam shapes can have specific functions on the processed material. The present invention offers the possibility to parallelize these processes and generate the special beam shapes with higher qualities in comparison to diffractive or holography-only means.
  • Example 10 A fourth application of the present invention - Optical manipulation and cell sorting:
  • the present invention allows the formation of more evenly distributed beamlet intensities or beamlets with specialized shapes.
  • Such beamlets can be optimized to be more effective at sorting cells while minimizing radiation induced thermal or chemical effects.
  • a beamlet can be doughnut shaped to minimize radiation at the center of the cell while maximizing scattering forces at the periphery.
  • the shape of the beamlets can be adapted to match the shape of the structured objects and hence maximize the trapping performance.
  • Example 11 A fifth application of the present invention - Structured microscopy:
  • the present invention can efficiently provide the required structured beams into 3D biological media, while being free from speckles.
  • Example 12 A sixth application of the present invention - Intelligent lighting:
  • Static phase elements made from plastic or glass can be produced economically and used for more common applications such as structured illumination for guiding, displays and sign applications or to aid in machine vision such as that found in motion detection for video game control or 3D profile measurements.

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  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

La présente invention concerne un dispositif de projection pour recevoir et distribuer un faisceau lumineux, comprenant : un élément de façonnage de lumière (10) comprenant un profil de façonnage de lumière (11) configuré pour former un faisceau lumineux profilé ; un élément de lentille (20) configuré pour transformer le faisceau lumineux profilé en un domaine de fréquence spatiale pour former un faisceau lumineux transformé de fréquence spatiale ; un élément de filtrage de fréquence spatiale (30) configuré pour modifier le faisceau lumineux transformé de fréquence spatiale dans le domaine de fréquence spatiale pour former un faisceau lumineux filtré de fréquence spatiale ; et un élément holographique (40) configuré pour diffracter le faisceau lumineux filtré de fréquence spatiale, en formant ainsi une pluralité de petits faisceaux lumineux projetés (51) dans un volume spatial.
PCT/EP2016/059760 2015-04-30 2016-05-02 Dispositif de projection de lumière 3d WO2016174262A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113504717A (zh) * 2021-07-09 2021-10-15 浙江大学 基于时空聚焦的均匀全息双光子显微系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5426521A (en) * 1991-12-24 1995-06-20 Research Development Corporation Of Japan Aberration correction method and aberration correction apparatus
WO2005096115A1 (fr) 2004-03-31 2005-10-13 Forskningscenter Risø Production de champ electromagnetique 3d specifique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5426521A (en) * 1991-12-24 1995-06-20 Research Development Corporation Of Japan Aberration correction method and aberration correction apparatus
WO2005096115A1 (fr) 2004-03-31 2005-10-13 Forskningscenter Risø Production de champ electromagnetique 3d specifique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113504717A (zh) * 2021-07-09 2021-10-15 浙江大学 基于时空聚焦的均匀全息双光子显微系统

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